RMR dual illumination - aftermarket LED?

[SnowRooster]

Recently acquired a dual illumination RMR sight, it’s great for outside use, you can see the dot no problem. The minute you go inside however the dot disappears. My question is does anyone know of an aftermarket product like an LED that can be clipped on to the top of it? There used to be a guy in Colorado that made them for other fiber optic sights but I can’t find his website anymore.

If anybody knows anything that might help please let me know.